Iris diaphragm



June 10, 1924. 1,496,963-

A. WQLLENSAK nus DIAPHRAGM Original Filed July 29. 1920 I INVENTOR 72M W@i Awomsv Patented June 10, 1924.

UNITED STATES 1,496,963 PATENT OFFICE.

ANDREW "WOLLENSAK, O15 ROCHESTER, NEW YORK, ASSIGNOR TO WOLLENSAK OPTI-CAL COMPANY, OF ROCHESTER, NEW YORK, A CORPORATION OF NEJV YORK.

IRIS DIAPHRAGM.

Original application filed July 29, 1920, Serial No. 399,939. Dividedand this application filed December 4, 1920. Serial No. 428,356.

To all whom it may concern:

Be it known that I, ANDREW lVoLLnNsnn, a citizen of the United States,and resident of Rochester, in the county of Monroe and State of NewYork, have invented certain new and useful Improvements in IrisDiaphragms, of which the following is a specification.

The present invention relates to iris diaphragms, this application beinga division of an application filed by me on the 29th day of July, 1920,Serial No. 399,939, an object of this invention bein to improve theconstruction of the iris diaphragm so as to make it easier to assembleand not so liable to get out of order. A further object of the inventionis to provide a ring interposed between the two rings of the diaphragmand acting to hold the oppo site ends of the blades in cooperativerelation with the two rings.

To these and other ends the invention consists of certain parts andcombinations of parts, all of which will be hereinafter described, thenovel features being pointed out in the appended claims.

In the drawings:

Figs. 1 and 2 are views of opposite sides of the iris diaphragm removedfrom "the casing, parts being broken away or removed for the purpose ofbetter illustration;

Fig. 8 is a detail view of the iris supporting plate;

Fig. 4: is a detail view of the spring ring;

Fig. 5 is a detail view of the operating ring of the iris diaphragm;

Fig. 6 is an enlarged sectional view through the iris diaphragm.

The iris diaphragm in the illustrated embodiment comprises a plateformed with a ring or annular central portion at and supporting lugs 5projected from opposite sides thereof, the supporting lugs beingdeflected in a plane atone side of the annular central portion 4. Alsoprojected from the periphery of the annular central portion are spacedlugs 6, these lugs also lying in a plane to one side of the annularcentral portion with the supporting lugs 5. In the spaces between theselugs 6, one of the ends of the iris blades 7 are mounted, the lugs 5also having openings 8 formed therein for the mounting of two of theblades. In order to hold these ends of the blades in the spaces betweenthe lugs 6 as well as to hold the opposite ends of the blades, 2. thinflexible ring 9 is provided formed with a pressed up annular rib 10 onone face. The opposite face of the ring abuts the side faces of the lugs6 so that the ends of the blades will be held in the spaces between saidlugs. The opposite ends of the blades are extended through the ring 9and cooperate with the opposite face of said ring 9, said ends alsoprojecting into openings 11 formed in the operating ring 12, theoperating ring having an annular projection 13 on its face opposed tothe annular projection 10 on said ring .9 and intersecting the openings11 so that the ring 9 with said projection 13 will hold the ends of theblades in the openings while permitting the turning of the operatingring to shift said ends in order to open and close the iris. Overhangingprojections 1a are pivotally mounted by eyelets 15 on the lugs 5 and areadapted to swing over the operating ring so as to hold said opeartingring as well as the ring 9 to the supportin iris plate. Some of the lugs6 may be provided with laterally deflected portions 16 for the purposeof guiding the operating ring 12 in its rotary movement. The rotarymovement of the operating ring may be effected by two lateral extensions17 and 18, which may also serve as a means for indicating the positionof the blades of the iris diaphragm.

This form of iris diaphragm adapts itself particularly for the buildingof the iris diaphragm independently of the shutter casing and thereafterto the installation of the same in the casing in completed form. Thelugs 5 form means for attaching the iris diaphragm to a suitablesupport. It is apparent that the construction of the iris diaphragmpermits the latter to be assem bled independently of the shutter casingand thereafter to be fitted to the casing in its assembled form. A ringis provided between the two rings of the iris diaphragm, which acts tohold the blades in cooperative relation at opposite ends with the rings,thus dispensing with pivot pins for the blades of the iris diaphragms.

hat I claim as my invention and desire to secure by Letters Patent is:

1. An iris diaphragm comprising two relatively rotatable rings, a bladeretaining ring interposed between the rings, and blades, each extendingthrough the retaining ring and held at one end between the retainingring and one of the first named rings and at the otherend between theretaining ring and the other of the first named rings.

2. An iris diaphragm comprising two relatively rotatable rings, one ofwhich has oilfset portions on one side thereof, a blade retaining ringsupported between said first named rings and resting upon said offsetportions, and blades, each extending through the retaining ring and heldat one end between the retaining ring and one of the first nan'ied ringsand at the other end between the retaining ring and the other of thefirst ings of both rings, and a ring interposed between the firstmentioned two rings and acting to hold the blades in the openings ofsuch rings.

AND RElV \VOLLEN-SAK.

